100 THE HOT-HOUSE. [Jan. 
glazed more than half the width of the house, or at most, to within 
eighteen inches of the doors; leaving that much for piers between 
the doors and the upright end sashes; the remainder may be car- 
ried up with brick as high as the roof- lights. 
In stoves that are so long as to require two fires, each with its 
respective ranges of flues, it will be proper to make a glass partition 
in the middle, and to have two tan-pits, that there may be two dif- 
ferent degrees of heat for plants from different countries; and were 
a range of stoves built all in one, and divided by glass partitions, at 
least half the width of the house, towards the front, it would be of 
great advantage to the collection, because they may have different 
degrees of heat according to their different natures, and likewise 
the air in each division may be shifted, by sliding the glasses of the 
partitions, or by opening the glass door which should be made be- 
tween each division, for the more easy passage from one to the other. 
In the warmest of these stoves or divisions, should be placed the 
most tender exotic trees and plants. These being natives of very 
warm countries, should be plunged in the bark -bed, and over the 
flues may be shelves on which to place the various species of Cac- 
tuses, Euphorbiums, Mesembryanthmeums, and other very tender 
succulent plants, which require to be kept dry in winter. 
As in this stove are placed the plants of the hottest parts of the 
East and West Indies, the heat should be kept up equal to that 
marked Ananas upon the botanical thermometers, and should never 
be suffered to be more than eight or ten degrees cooler at most, nor 
should the spirit be raised above ten degrees higher in the thermo- 
meter during the winter season, both which extremes will be equally 
injurious to the plants. 
The roofs of some stoves are so made, that the glasses do not 
slide either up or down, which is an evil of great magnitude; for 
where the sun is so powerful in the months of April and May, as it 
is in every part of the United States, the superabundance of heat 
collected in the house on very hot days, cannot be discharged by the 
doors and sliding upright-sashes in front, which forces the plants 
into an extreme state of vegetation, and renders them unfit to bear 
the open air towards the latter end of May, when otherwise the 
greater number of them might be brought out with safety, without 
receiving such a check by the transition, as many cannot recover 
during the summer, and causing many more to appear much less 
beautiful than they otherwise would, where they gradually inured to 
the open air in the hot- house before their being brought out, by 
occasionally sliding open the roof as well as the front-glasses, and 
never letting the heat arise in the house to too high a degree. 
Those destined to remain in the bark-bed, during summer, such 
as the pine-apple, &c. are still worse off; for, if the roof is kept on, 
they are rendered good for nothing, and if taken totally off, both 
them and the bark-bed are exposed to heavy rains, which destroy 
the heat of the one, and consequently injures the health, vigour, and 
fruit of the other: therefore all stoves ought to be constructed with 
sliding roof as well as front-lights. 
